Riveting mechanism



0Ct. 25, 1932. U R w DlNZL 1,884,611

RIVETING MECHANISM Filed July 23, 1928 2 Sheets-Sheet l INVENTOR= R W Dinzl,

Oct. 25, 1932. R. w. DlNZL RIVETING MECHANISM Filed July 25, 1928 2 Sheets-Sheet "NVENTOR RNV. 1

Patented Oct. 25, 1932 UNITED STATES PATENT oFFics RICHARD W. DINZL, OF MARGATE CITY, NEW JERSEY, ASSIGNOR TO SOUTHVTARK FOUNDRY ,MACI-IINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A COR- PORATION OF PENNSYLVANIA,

RIVETING MECHANISM Application filed July 23, 1928. Serial No. 294,881.

My invention relates to riveting mechanism, and one object of my invention is to provide means whereby the heads ofboilers and similar structures, cylindrical or otherwise, may

' be secured within the ends of the shell; my

invention comprising means particularly available for securing the final head in a boiler shell or other structure wherein such head is provided with a manhole opening or similar aperture.

A further object of my invention is to provide a self-contained hold-back structure supported by a suitable base, which base may be of integral construction; such hold-back structure being insertible within the shell of the boiler or other structure through a manhole opening or other aperture in the head to be'secured to the boiler or other shell whereby, particularly in the operation of securing the final head in a boiler shell or section or other container of the general character, the riveting operation will be effected with respect to asolid support or hold-back.

A further object of my invention is to provide acollapsible hold-back structure which may be disassembled for insertion in and removal from the boiler shell or other structure and assembled within the same for cooperation with riveting means disposed externally of the boiler shell or other structure and arranged in line with the hold-back structure.

These and other features of my invention are more fully described hereinafter; reference being had to the accompanying drawings, in which:

Figure 1 is an elevation, partly in section, of riveting mechanism within the scope of my invention.

Fig. 2 is a plan viewof the same; the boiler shell being shown in section;

' Fig. 3 is asectional plan view on the line IIIIII, Fig. 1, and g V Fig. 4; is'a cross sectional view on the line IVIV, Fig. 2.

In general, boilersand similar shells or containers comprising cylindrical or other sections which may have one or more seams joined by rivets on a line (or lines) parallel or substantially parallel with the longitudinal axis of such sections require completion by the cult to produce a satisfactory job with manpower in addition to the discomfort of the Operator working in a confined space. While in the use of my improved structure it is necessary to employ an operator within the shell, his duties are simply to place the rivets and guide the hold back.

Referring to the drawings, 1 represents a base of massive construction, preferably a singlecasting, supported on' a suitable bed 2 in any desired manner, and provided with abutments 3 and 3. The boiler shell is inclicated at 4, and the head 5 is provided with a manhole opening 5*. Between the abutments 3 and 3 of the base a post 6 is arranged, with a supporting portion 6 having a cross sectional cont-our substantially like that of the manhole opening 5 in the head 5 of the boiler shell, and this post may be inserted through such manhole opening. The upper end of this post is provided with a half-round seat receiving a tubular sleeve 7, which may be clamped to the post by a cap member 8; bolts 9 being provided for the purpose.

The tubular shell carries horizontally disposed plunger members lO, normally held in retracted position by means of springs 11; such plunger members having shouldered end portions 12, against which such springs may act and normally hold the plungers in the retracted position. These plungers may be keyed or splined with respect to the shell so as to be held against turning.

The boiler section 4, with the head 5, arranged therein, is so supported and disposed; being usually suspended from a crane, that the position of the plungers 10 is in line with the rivets to be applied, and the ends 10 and 10" of these plungers are recessed so that they may engage the flange 5", of the head over a rivet head (or heads) in all instances; the end 10 of one plunger serving as the hold-back or part against which the riveting takes place while the end 10" of the other plunger engages the flange of the head directly opposite the riveting point. This end 10 is preferably of extqnded width, as indicated in Figs.

2 and 3; conforming with the curvature or other shape of the head, and is removable for replacement by other ends conforming to the curvature or other shape of the flange in smaller or larger heads to be fitted in boiler or other shells.

The plungers 10 are maintained in position to contact with the opposite walls of the flange of the head by means of a wedge-block 15, forced between the shouldered end portions of the plungers whose faces are beveled, as indicated at 12*; the sleeve being apertured for the passage of the wedge-block. This wedge-block is carried by a rod 16, vertically movable in the post 6, and whose lower end is provided with a piston 17, fitting within the cylinder 18 and raised, in the present instance, by fluid pressure.

The abutment 3 is provided with an adj ustable block 19, shaped to conform to the contour or other shape of the boiler shell or other structure, which block is grooved at 19 to accommodate the external heads of the rivets, indicated by dotted lines. This block may have a stem 19 slidably mounted in said abutment 3, which may be held in adjusted positions by a set screw 19.

The riveting head 20 passes through the oppositely disposed abutment 3, and is forced into position with respect to a rivet, indicated at m, by means of fluid pressure acting upon a ram or piston 21, disposed within a horizontally arranged cylinder 22; the latter havin a pullback cylinder 23 to retract the riveting head after a rivet has been headed.

The riveting head and its operating mechanism may be carried by a support 24, mounted on a base 1, which may be independent of the base 1, or connected thereto as indicated by dotted lines. After each riveting operation has been completed, the plungers within the boiler section comprising the hold-back are retracted by lowering the wedge-block 15 and the boiler (or base) is then moved to an extent necessary to bring the next hole (or set of holes in shell and head) receiving a rivet'in line with the riveting head, and the operation may proceed as before, and so on until the entire head has been secured to the boiler shell. During this operation, a workman is within the shell to set the rivets and guide the plungers into registering position. When one line of rivets has been set in place, the shell and head may be raised or lowered, as the case may be, for

the setting of a second and other row, as may be desired.

After the boiler head has been riveted in place, the wedge-block is withdrawn; the cap member 8 is removed, together with the tubular sleeve 7, and thenthe post is passed out through the manhole by raising the boiler, after which the plungers with the sleeve 7 may be dropped through the manhole and the machine made ready for the reception of a second boiler shell or other structure and the head to be attached thereto.

The boiler shell may be supported by a suitable crane in operative position, and under such conditions, it may be readily turned to bring successive rivet holes into position. Temporary supports may be provided between the shell and the base at the underside of the head, as may be desired. In lieu of this arrangement, the base 1 may be mounted upon a turntable, together with the riveting head, so that the riveting structure as a whole may be moved bodily with respect to the boiler shell while the latter is held in a relatively fixed position; the riveting mechanism being halted with respect to the shell when the riveting head is in line with any one of the rivet holes.

I claim:

1. In a riveting device, the combination of an integral base, aligned abutments carried by said base, a separable and collapsible hold-back structure vertically arranged for disposal within a boiler shell operativel positioned between said abutments; said oldback structure comprising a hollow post car ried by the base and arranged to enter a. manhole opening in a head of a boiler shell, a cylindrical sleeve disposed at right angles to and supported by the upper end of said post; the latter providing a seat for said sleeve, detachable clamping means for holding said sleeve in fixed position with respect to the post, a pair of oppositely disposed plungers arranged to span the space between opposite inner walls of a boiler shell movably mounted in said sleeve; said plungers having at one end heads engaging the inner wall of a boiler shell and at their opposite ends shouldered portions fitting the internal bore of the sleeve with beveled outer faces, tension means engaging said shouldered ends and tending to hold said plungers away from the inner wall of a boiler shell, a wedge-block fitting between the beveled ends of said plungers, fluid-operated means for actuating said wedge-block to press said plungers outwardly including a rod connected to said wedgeblock and a piston for actuating said rod, an adjustable stop carried by one of the abutments for engagement with the external wall of a boiler shell, and externally disposed riveting means operable through the other abutment in line with said hold-back structure and said adjustable stop.

2. In a riveting device, the combination of a base, aligned abutments integral with said base, an adjustable block forming a backing support for a boiler shell carried by one of said abutments, a hold-back supported by the base and arranged within said shell; said hold-back including oppositely disposed plunger members arranged in line for engagement with the inner wall of the boiler shell, asleeve supporting said plunger members, a post supported by the base, a tubular shell carried by the post and supporting said sleeve, means for maintaining said plunger members against opposite walls of the boiler shell including a wedge-block operable between the same, a vertically movable stem disposed within said tubular shell, and connected to said Wedge-block, fluid-pressure means for moving said stem and externally disposed riveting means operable in line with said plunger members and said adjustable backing block.

In Witness whereof I have signed this specification. RICHARD W. DINZL. 

